CN217160070U

CN217160070U - Self-rectifying LED lamp panel for refrigerator

Info

Publication number: CN217160070U
Application number: CN202121420391.4U
Authority: CN
Inventors: 刘涛; 骆海涛; 何宝石
Original assignee: Changhong Meiling Co Ltd
Current assignee: Changhong Meiling Co Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-08-09
Anticipated expiration: 2031-06-24

Abstract

The utility model discloses a refrigerator is with rectifying LED lamp plate certainly relates to technical field. The utility model discloses in: the power supply circuit consists of a protection circuit, a rectifier bridge D1 and a voltage stabilizing circuit which are connected in sequence; the protection circuit is arranged between the input end of the rectifier bridge D1 and the mains supply; the rectifier bridge D1 rectifies the alternating current power supply at the input end and outputs the rectified alternating current power supply to the voltage stabilizing circuit; the input end of the constant current driving circuit is connected with the output end of the voltage stabilizing circuit; the constant current driving circuit comprises a constant current driving chip U1, a discharge resistor R5 and a current limiting circuit; the lighting circuit consists of a plurality of LED lamp beads connected in series; the lighting circuit is arranged in series between the discharge resistor R5 and the OUT1 terminal of the constant current driving chip U1. The utility model outputs constant current to drive the LED lamp beads to illuminate by arranging the constant current driving chip; the high-power illumination is realized, the requirement on the indoor illumination brightness of the refrigerator is met, meanwhile, the plastic housing is not required to be packaged, the circuit is simple, and peripheral components of the chip are few.

Description

Self-rectifying LED lamp panel for refrigerator

Technical Field

The utility model belongs to the technical field of the light, especially, relate to a refrigerator is with rectifying LED lamp plate certainly.

Background

The LED lamp is widely applied to the fields of illumination, indication and the like as a fourth-generation green light source, the illumination of the LED lamp has the advantages of high lighting effect, long service life and low power consumption, the illumination of the interior of the refrigerator is mainly achieved by the illumination of the LED lamp at present, the grade of the refrigerator can be improved, the energy consumption of the refrigerator is reduced, the selling point of the refrigerator is improved, and the market trend is met.

For the electrically controlled refrigerator with higher grade refrigerator, because it has computer board, it can output stable DC12V power supply, so it is easy to realize LED lamp lighting.

However, for a mechanical temperature control type refrigerator, the refrigerator is low in positioning grade, does not have a computer board, cannot provide a stable DC12V power supply, and only has an AC high voltage AC220V input, but in order to realize LED lamp illumination, the AC high voltage 220V needs to be converted into a stable DC low voltage, and the design cost is very high according to a conventional switching power supply, so that a self-rectifying LED lamp with a resistance-capacitance step-down power supply scheme with low cost is often selected, the power supply scheme is suitable for a lamp with low power, the illumination brightness is dark, generally, only below 60 lumens can be achieved, and the illumination effect of the refrigerator with a large volume of a refrigerating chamber is poor. And resistance-capacitance step-down power is the non-isolation power, needs to use the plastics housing to encapsulate whole lamp plate and use, just can satisfy the safe insulating requirement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a self-rectifying LED lamp panel for a refrigerator, which is characterized in that a constant current driving chip is arranged to output constant current to drive an LED lamp bead to illuminate; the high-power illumination is realized, the requirement on the indoor illumination brightness of the refrigerator is met, meanwhile, the plastic housing is not required to be packaged, the circuit is simple, the peripheral components of the chip are few, and the cost is lower compared with that of a resistance-capacitance voltage reduction type self-rectification LED lamp.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a refrigerator is with rectifying LED lamp plate certainly, include: the power supply circuit consists of a protection circuit, a rectifier bridge D1 and a voltage stabilizing circuit which are connected in sequence; the protection circuit is arranged between the input end of the rectifier bridge D1 and the mains supply; the rectifier bridge D1 rectifies the alternating current power supply at the input end and outputs the rectified alternating current power supply to the voltage stabilizing circuit; the input end of the constant current driving circuit is connected with the output end of the voltage stabilizing circuit; the constant current driving circuit comprises a constant current driving chip U1, a discharge resistor R5 and a current limiting circuit; the lighting circuit consists of a plurality of LED lamp beads connected in series; the lighting circuit is arranged between the discharge resistor R5 and the OUT1 end of the constant current driving chip U1 in series.

Further, the protection circuit comprises resistors R1 and R2 and a piezoresistor RV 1; and the live wire end and the zero wire end of the commercial power are respectively connected in series with a resistor R1 and a resistor R2 and then connected in parallel with a piezoresistor RV 1.

Furthermore, the type of the rectifier bridge D1 is a full-wave rectifier bridge MBL5S, the input voltage range of the rectifier bridge D1 is AC 220V-AC 240V or AC 100V-AC 120V, and both high-voltage input and low-voltage input can be realized, so that the universality of parts can be better improved.

Further, the voltage stabilizing circuit adopts a polar capacitor C1; one end of the polar capacitor C1 is connected with the anode of the rectifier bridge D1, and the other end of the polar capacitor C1 is connected with the cathode of the output end.

Further, the current limiting circuit is formed by connecting a resistor R3 and a resistor R4 in parallel; one end of the current limiting circuit is connected with the RSET1 end of the constant current driving chip U1, and the other end of the current limiting circuit is connected to the negative electrode of the rectifier bridge D1; the resistance values of the resistor R3 and the resistor R4 are 200 ohms or less.

Furthermore, one end of the discharge resistor R5 is connected with GND of the constant current driving chip U1 and is connected with the polar capacitor C1 in parallel; the resistance of the discharge resistor R5 is 1M ohm or more.

Further, the model of the constant current driving chip U1 is ME8608 or GT 1582.

The utility model discloses following beneficial effect has:

the utility model discloses a set up the constant current driver chip, output the invariable current drive LED lamp pearl and throw light on; the high-power illumination is realized, the requirement on the indoor illumination brightness of the refrigerator is met, meanwhile, the plastic housing is not required to be packaged, the circuit is simple, the peripheral components of the chip are few, and the cost is lower compared with that of a resistance-capacitance voltage reduction type self-rectification LED lamp.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a circuit diagram of a self-rectifying LED lamp panel for a refrigerator.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1, the utility model relates to a self-rectifying LED lamp panel for a refrigerator, which comprises a power circuit, a constant current driving circuit and a lighting circuit; the power supply circuit consists of a protection circuit, a rectifier bridge D1 and a voltage stabilizing circuit which are connected in sequence; the protection circuit is arranged between the input end of the rectifier bridge D1 and the mains supply; the protection circuit comprises resistors R1 and R2 and a piezoresistor RV 1; the live wire end and the zero wire end of the commercial power are respectively connected in series with a resistor R1 and a resistor R2 and then connected in parallel with a piezoresistor RV 1; the rectifier bridge D1 rectifies the alternating current power supply at the input end and outputs the rectified alternating current power supply to the voltage stabilizing circuit; the type of the rectifier bridge D1 is a full-wave rectifier bridge MBL5S, and the rectifier bridge D1 is used for realizing the rectification of power supply voltage and changing a full-wave alternating-current waveform into a half-wave direct-current waveform; the input voltage range of the rectifier bridge D1 is AC 220V-AC 240V, or AC 100V-AC 120V, and both high-voltage input and low-voltage input can better improve the universality of parts; the voltage stabilizing circuit adopts a polar capacitor C1; one end of the polar capacitor C1 is connected with the anode of the rectifier bridge D1, and the other end is connected with the cathode of the output end;

the input end of the constant current driving circuit is connected with the output end of the voltage stabilizing circuit; the constant current driving circuit comprises a constant current driving chip U1, a discharge resistor R5 and a current limiting circuit; the model of the constant current driving chip U1 is ME8608 or GT 1582; the ME8608 or GT1582 is internally provided with a 450V high-voltage MOS tube, so that constant current can be output, an over-temperature adjusting function is achieved, when the input voltage is too high or the output current is large, and the temperature of a chip is increased, the LED current can be reduced, and the system is prevented from being damaged due to overheating; the current limiting circuit is formed by connecting a resistor R3 and a resistor R4 in parallel; one end of the current limiting circuit is connected with the RSET1 end of the constant current driving chip U1, and the other end of the current limiting circuit is connected to the negative electrode of the rectifier bridge D1; the resistance values of the resistor R3 and the resistor R4 are 200 ohms or less; one end of the discharge resistor R5 is connected with GND of the constant current driving chip U1 and is connected with the polar capacitor C1 in parallel; the resistance value of the discharge resistor R5 is 1M ohm or more;

the lighting circuit consists of a plurality of LED lamp beads connected in series; the number of the LED lamp beads is at least 3; the LED lamp beads adopt surface-mounted LED lamp beads; the lighting circuit is arranged in series between the discharge resistor R5 and the OUT1 terminal of the constant current driving chip U1.

Example two: the working principle of the protection circuit is as follows: when abnormal voltage input such as lightning stroke, voltage jitter and the like is met, the high-power resistors R1 and R2 can share larger current, and the voltage dependent resistor RV1 can absorb redundant surge, so that the whole circuit is protected from being broken down, and a chip is protected from being damaged.

Example three: polarity electric capacity C1 can charge when the LED lamp plate circular telegram, and when the LED lamp plate outage, polarity electric capacity C1 can discharge, will produce the return circuit between LED lamp pearl, single channel LED constant current drive control chip U1 and current-limiting resistor R3, R4 like this, cause LED lamp pearl to continue to light, influence the inside illuminating effect of refrigerator. Therefore, in order to reduce afterglow of the lamp bead, the discharge resistor R5 is generally selected to be a resistor with a resistance value of more than 1M ohm.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a refrigerator is with rectifying LED lamp plate certainly, its characterized in that includes:

the power supply circuit consists of a protection circuit, a rectifier bridge D1 and a voltage stabilizing circuit which are connected in sequence;

the protection circuit is arranged between the input end of the rectifier bridge D1 and the mains supply;

the rectifier bridge D1 rectifies the alternating current power supply at the input end and outputs the rectified alternating current power supply to the voltage stabilizing circuit;

the input end of the constant current driving circuit is connected with the output end of the voltage stabilizing circuit; the constant current driving circuit comprises a constant current driving chip U1, a discharge resistor R5 and a current limiting circuit;

the lighting circuit consists of a plurality of LED lamp beads connected in series; the lighting circuit is arranged between the discharge resistor R5 and the OUT1 end of the constant current driving chip U1 in series.

2. The self-rectifying LED lamp panel for the refrigerator according to claim 1, wherein the protection circuit comprises resistors R1 and R2 and a piezoresistor RV 1; the live wire end and the zero wire end of the commercial power are respectively connected in series with a resistor R1 and a resistor R2 and then connected in parallel with a voltage dependent resistor RV 1.

3. The self-rectifying LED lamp panel for the refrigerator as claimed in claim 1, wherein the type of the rectifier bridge D1 is full wave rectifier bridge MBL5S, and the input voltage range of the rectifier bridge D1 is AC 220V-AC 240V, or AC 100V-AC 120V.

4. The self-rectifying LED lamp panel for the refrigerator according to claim 1, wherein the voltage stabilizing circuit adopts a polar capacitor C1; one end of the polar capacitor C1 is connected with the anode of the rectifier bridge D1, and the other end of the polar capacitor C1 is connected with the cathode of the output end.

5. The self-rectifying LED lamp panel for the refrigerator as claimed in claim 1, wherein the current limiting circuit is formed by connecting a resistor R3 and a resistor R4 in parallel; one end of the current limiting circuit is connected with the RSET1 end of the constant current driving chip U1, and the other end of the current limiting circuit is connected to the negative electrode of the rectifier bridge D1; the resistance values of the resistor R3 and the resistor R4 are 200 ohms or less.

6. The self-rectifying LED lamp panel for the refrigerator as claimed in claim 4, wherein one end of the discharge resistor R5 is connected with GND of the constant current driving chip U1 and is connected in parallel with the polar capacitor C1; the resistance of the discharge resistor R5 is 1M ohm or more.

7. The self-rectifying LED lamp panel for the refrigerator according to claim 1, wherein the model of the constant current driving chip U1 is ME8608 or GT 1582.